Genesis of Permian granites along the Kangguer Shear Zone, Jueluotage area, Northwest China: Geological and geochemical evidence

Genesis of Permian granites along the Kangguer Shear Zone, Jueluotage area, Northwest China: Geological and geochemical evidence
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觉罗塔格地区康古尔剪切带二叠纪花岗岩成因:地质和地球化学证据

DOI:
10.1016/j.lithos.2014.03.023
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发表时间:
2014-06
期刊:
影响因子:
3.5
通讯作者:
Ruofei Zhang
Ruofei Zhang
中科院分区:
地球科学2区
文献类型:
--
作者:
Yu Fan;Yufeng Deng;Chao Xu;Ruofei Zhang

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中国西北东天山觉勒瓦奇地区沿康格尔剪切带(KSZ)发育二叠系基性和长英质侵入岩。研究对象为二叠纪长英质侵入岩(288 ~ 276.2 Ma)。系统的地质和地球化学调查表明,KSZ西部(地坎、官岛和红石)花岗岩岩体的Al含量低于KSZ东部(龙东、黄山和白山东),碱含量高于KSZ东部。西部花岗岩岩体的晶体分馏程度高于东部花岗岩岩体。东、西二叠统花岗岩侵入体均来源于幼时地壳,其Nd-Pb同位素特征表现为DM型和EMII型混合地幔组成。西二叠统和东二叠统花岗岩均形成于后碰撞背景。KSZ西部的地坎、官岛和红石岩体形成于伸展构造环境,而KSZ东部的龙洞、黄山和白山东岩体形成于挤压构造环境。
Permian mafic and felsic intrusions occur along the Kangguer Shear Zone (KSZ) in the Jueluotage area, Eastern Tianshan, northwest China. This study focuses on the Permian felsic intrusions (288–276.2 Ma). Systematic geological and geochemical investigations show that granite plutons in the western KSZ (Dikan, Guandao and Hongshi) have lower Al and higher alkali contents than those in the eastern KSZ (Longdong, Huangshan and Baishandong). The western granite plutons experienced higher degrees of crystal fractionation than the eastern granite plutons. Both of the western and eastern Permian granite intrusions along KSZ were derived from juvenile crust, the Nd–Pb isotopic characteristics of which exhibit mixed compositions of DM and EMII type mantles. Both of the western and eastern Permian granites along KSZ were formed within post-collision background. The Dikan, Guandao and Hongshi plutons in the west KSZ sector were formed in an extensional tectonic setting, whereas the Longdong, Huangshan and Baishandong plutons in the east KSZ formed in a compressional tectonic setting.
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